Pat Mayse Lake: 99.6% full as of 2022-07-01

The elevation-storage rating curve used to produce the storage hydrograph is made of two segments: (1) the segment up to the conservation pool top (below the red line) is based on measured data, and (2) the segment in the flood pool (above the red line) is an extrapolation from the first segment and shouldn't be relied upon for flood storage information.

Historical Data

Date Percent Full Mean Water Level
(ft)
Reservoir Storage
(acre-ft)
Conservation Storage
(acre-ft)
Conservation Capacity
(acre-ft)
Surface Area
(acres)
Today 2022-07-01 99.6 450.92 117,393 113,233 113,683 5,629
Yesterday 2022-06-30 99.7 450.93 117,449 113,289 113,683 5,631
2 days ago 2022-06-29 99.8 450.96 117,618 113,458 113,683 5,634
1 week ago 2022-06-24 100.0 451.16 118,747 113,683 113,683 - n.a. -
1 month ago 2022-06-01 100.0 451.50 120,676 113,683 113,683 - n.a. -
3 months ago 2022-04-01 91.4 449.23 108,046 103,886 113,683 5,367
6 months ago 2022-01-01 90.2 448.97 106,656 102,496 113,683 5,329
1 year ago 2021-07-01 100.0 452.29 125,206 113,683 113,683 - n.a. -
*

Percent Full is based on Conservation Storage and Conservation Capacity and doesn't account for storage in flood pool.

**

   Values above, including today's are averaged conditions. For near real-time instantaneous water level, see table below or the interactive map viewer.

Most Recent Instantaneous Water Level

Date/time Water Level
(ft)
Conservation Pool Elevation
(ft)
Height Above Conservation Pool
(ft)
Most recent 2022-07-01 06:00 450.91 451.00 -0.09 below flood pool
1 hour prior 2022-07-01 05:00 450.92 451.00 -0.08 below flood pool
2 hours prior 2022-07-01 04:00 450.92 451.00 -0.08 below flood pool
6 hours prior 2022-07-01 00:00 450.92 451.00 -0.08 below flood pool
12 hours prior 2022-06-30 18:00 450.92 451.00 -0.08 below flood pool
24 hours prior 2022-06-30 06:00 450.93 451.00 -0.07 below flood pool
48 hours prior 2022-06-29 06:00 450.97 451.00 -0.03 below flood pool
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1967-01-01
Vertical datum NGVD29
Gauge USGS:07335390
Gauge USACE:MYST2
Gauge USGS:07335390
Dead pool elevation 415.00 ft above NGVD29
Service spillway crest elevation 451.00 ft above NGVD29
Emergency spillway crest elevation 477.00 ft above NGVD29
Flood pool elevation 460.50 ft above NGVD29
Top of dam elevation 488.50 ft above NGVD29
Conservation pool elevation 451.00 ft above NGVD29
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

1967-01-01 (source: USGS)
2008-07-01 (source: TWDB) : GIS Data

Lake Location